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MDO, also known as Signboard, is an exterior-grade plywood with a high-quality paper face saturated with phenolic resin solids. The plywood below the paper face is smooth, clear and free of patches, providing a smooth surface with minimal grain showing through. MDO plywood is water-proof and weather-resistant. MDO plywood can be sawn, nailed, routed, shaped and drilled. Although this product is designed for exterior use, it works well inside the home in areas that need to be smooth and hold up well to moisture. This product resists inclement weather areas well. It is often used for exterior signs and sub-board underneath laminates for countertops. It is recommended to apply an exterior grade primer and paint to this product if using in an exterior application. Primer and paint adhere nicely to the paper face. When applied with exterior grade primer and paint, this product holds up much better than regular plywood.